baber/WOPTO huggingface dataset:
Patent TW-I277183-B (TW)
Title: A routing design to minimize electromigration damage to solder bumps
Inventor: DAUKSHER WALTER JOHN
IPC: H01L23/12
Filed: 2005-08-17
Granted: 2007-03-21
Abstract: A novel pad structure for an integrated circuit component that utilizes a bump interconnect for connection to other integrated circuit components that produces a relatively uniform current distribution within the bump of the bump interconnect is presented. The pad structure includes an inner pad implemented on an inner conductive layer of the integrated circuit component, an outer pad implemented on an outer conductive layer of the integrated circuit component, and a plurality of vias connecting the inner pad and outer pad. The outer pad is sealed preferably around its edges with a passivation layer, which includes an opening exposing a portion of the outer pad. The vias connecting the inner pad and outer pad are preferably implemented to lie in a via region within the footprint of the pad opening.
Patent TW-I283209-B (TW)
Title: Conductor rail
Inventor: KRAUDY KYLE D
IPC: B60M1/30
Filed: 2005-12-15
Granted: 2007-07-01
Abstract: A conductor rail comprising a main body having a facing cap mounted thereon. The main body is comprised of aluminum while the facing cap is comprised of a stainless steel material. The main body of the conductor rail has a head portion which has channels extending into the opposite sides thereof. The facing cp comprises a top portion which is positioned upon the upper part of the head portion and which has side portions welded to plate members positioned in the channels.
Patent TW-I274023-B (TW)
Title: Mechanism for vacuum packing
Inventor: CHANG YEN-MING
IPC: B65D81/20
Filed: 2005-12-29
Granted: 2007-02-21
Abstract: The invention relates to a mechanism for vacuum packing, which comprises main body, vacuum casing, carrier and installing bases. The vacuum casing collocates with correlative transferring device to reciprocate relatively to main body, and reciprocating frame is used to collocate several stacks of installing bases to reach the purpose of producing more than one vacuum heat-insulating sheets in vacuum process. It is different from conventional conchoidal vacuum body.
Patent TW-I281969-B (TW)
Title: Recirculation device of ball screw
Inventor: LIAO CHI-MENG
IPC: F16H25/22
Filed: 2006-01-17
Granted: 2007-06-01
Abstract: A ball screw has at least one recirculation device have two recirculation channel, which set in the middle of the ball nut, and two recirculation devices each has one recirculation channel, which set in the both ends of the ball nut. By the way of these devices assembly, the balls in the ball nut have at least two endless circulations, and the nut is ground to have an offset value on the center pitch to cause the preload.
Patent TW-I405783-B (TW)
Title: Biuret compounds, their preparation and use, and intermediates in their preparation
Inventor: HAUBENNESTEL KARLHEINZ
IPC: C09D7/43
Filed: 2006-03-28
Granted: 2013-08-21
Abstract: Biuret compounds (I) are new. Biuret compounds (I) of formula (R 2>-Y 1>-OCNH-R 1>-N-((CO-NH-R 3>-[Z-R 4>-Z-R 5>] a-NH)-CO-N-(R 2>-Y 1>-OCHN-R 1>)-(CONH-R 1>-NHCO-Y 1>-R 2>))-CONH-R 1>-NHCO-Y 1>-R 2>) are new. R 1>, R 3>-R 5>2-18C-alkyl, cycloalkyl, aryl or aralkyl; Y 1>O and/or NH; R 2>4-22C-alkyl, 3-18C-alkenyl, cycloalkyl, aralkyl, C mH 2m+1(O-C nH 2n) x-(O-CH(C 6H 5)-CH 2) u, C mH 2m+1(OOC-C vH 2v) x or X-C 6H 4-(O-C nH 2n) x-(O-CH(C 6H 5)-CH 2) u; m : 1-22; n : 2-4; x, u : 0-15; v : 4-5; X : 1-12C-alkyl or (C 6H 5) 1-4; Z : COO, NHCO, NHCOO and/or NHCONH; and a : 1-20. Independent claims are included for: (1) a method for the preparation of (I); and (2) the urethane- and/or uretdione (A) containing urea.
Patent TW-I313018-B (TW)
Title: Keypad and keypad assembly
Inventor: LEE JOO-HOON
IPC: G06F3/023
Filed: 2006-03-31
Granted: 2009-08-01
Abstract: A keypad includes a light guide panel, the interior of which light propagates through, a film positioned on the upper surface of the light guide panel and having at least one key button positioned on the upper surface thereof, and at least one reflective pattern fixedly positioned with respect to the light guide panel to reflect a part of the light, which propagates through the interior of the light guide panel, towards the key button.
Patent TW-I413251-B (TW)
Title: Pixel performance improvement by use of a field-shield
Inventor: HUITEMA HJALMAR EDZER AYCO
IPC: H01L29/04
Filed: 2006-06-29
Granted: 2013-10-21
Abstract: A pixel cell (100) and method for making the same for an active matrix display includes a pixel pad (110) and a thin film field effect transistor (106) which selectably couples a signal to activate/deactivate the pixel pad. A field shield (112) is formed on an insulating layer (102) and connected to the pixel pad through the insulating layer such that the field shield extends over at least a portion of the pixel pad. The field shield may extend over the thin film transistor and form a second gate (215) used to enhance the performance of the thin film transistor and the pixel cell.
Patent TW-I306423-B (TW)
Title: Method for bonding between electrical devices using ultrasonic vibration
Inventor: PAIK KYUNG WOOK
IPC: B23K20/10
Filed: 2006-11-22
Granted: 2009-02-21
Abstract: The present invention is to provide a method for bonding between electrical devices, including the steps of: aligning electrodes on a bonded area of an upper electrical device and a lower electrical device to be bonded; and curing of adhesives by applying ultrasonic energy to the adhesives between the upper electrical device and the lower electrical device.
Patent TW-I443965-B (TW)
Title: Switched mode power amplification
Inventor: SJOLAND HENRIK
IPC: H03F3/217
Filed: 2007-06-05
Granted: 2014-07-01
Abstract: The invention concerns a method of amplifying a radio frequency signal, a switched mode power amplifying device and a radio transmission device comprising such a power amplifying device. The switched power amplifying device (10) comprises an envelope signal input (EI), an arithmetic combining unit (SUB) between the envelope signal input and a modulating unit (PWM), configured to modulate a modified envelope signal (E') output by the arithmetic combining unit with a carrier (C) for obtaining a modulated signal, an amplifying unit (PA) connected to the modulating unit providing an output signal (0) and a feedback path connected between the amplifying unit (PA) and the arithmetic combining unit (SUB). The feedback path comprises a low pass filter (LPF) for filtering the output signal (0) and a signal processing unit (DSP) processing the filtered signal (Vf) in order to obtain an estimated radio frequency amplitude (A E ) for provision to the arithmetic combining unit.
Patent TW-I376421-B (TW)
Inventor: SATOH HIRONORI
IPC: C22C38/04
Filed: 2008-04-11
Granted: 2012-11-11
Abstract: The present invention provides hot dip plated high strength steel sheet for press forming use having a tensile strength of 380 MPa to less than 540 MPa, having a press formability able to be used for the automobile field, in particular fuel tank applications, and having superior secondary work embrittlement resistance and superior seam weld zone low temperature toughness and further superior plateability and a method of production of the same and provides 
hot dip plated high strength steel sheet for press forming use of the present invention having cold rolled steel sheet and a hot dip plated layer formed on the surface of said cold rolled steel sheet,  characterized in that  said cold rolled steel sheet contains, by mass%, C: 0.0005 to 0.0050%, Si: over 0.3 to 1.0%, Mn: 0.70 to 2.0%, P: 0.05% or less, Ti: 0.010 to 0.050%, Nb: 0.010 to 0.040%, B: 0.0005 to 0.0030%, S: 0.010% or less, Al: 0.01 to 0.30%, and N: 0.0010 to 0.01%, where the Ti content (%) is [Ti], the B content (%) is [B], and the P content (%) is [P], the TB *  expressed by the following formula <A> being 0.03 to 0.06 and the following formula <B> being satisfied:     TB  *   =   0.11  -   Ti    /   ln     B   ×  10000           P   ‰¤  10  ×   B   +  0.03
Patent TW-I411347-B (TW)
IPC: H05B3/10
Filed: 2008-07-25
Granted: 2013-10-01
Abstract: This invention relates to a flexible electrothermal product made of activated carbon fiber and its manufacturing method, which involve a carbon-fiber elecctrothermal product and its manufacturing method. This invention solves the problems of existing electrothermal flexible products, such as non-uniform heat dissipation and temperature rise on the surface, incapability of bending, short working life and poor safety performance. The activated carbon fiber cloth and woven fiber cloth of the flexible electrothermal product made of activated carbon fiber are connected via an epoxy resin adhesive layer. Two ends between the activated carbon fiber cloth and the epoxy resin adhesive layer are respectively provided with electrically conductive copper nets. The electrically conductive copper nets connect with the input lines of power source. The manufacturing method is as follows: 1. Spray-coating the epoxy resin adhesive onto the woven fiber cloth, baking it and then hot-pressing it. 2. Connecting the electrically conductive copper nets and the input lines of power source; and laying the activated carbon fiber cloth and then hot-pressing it twice. In this invention, the carbon fiber structure is used as the heating surface which has the advantages such as light weight, soft texture, uniform and stable electrothermal performance, rapid temperature rise, safety and reliability, long operation life, and so on. Further, its fabrication process is simple and easy to operate.
Patent TW-I486730-B (TW)
Title: Pressure sensor
Inventor: WINKLER YVES
IPC: G04B47/06
Filed: 2009-04-23
Granted: 2015-06-01
Abstract: The sensor (6) has a flexible membrane (11) co-operating with a transmission device (10) that provides, from deformation of the membrane, a value representative of pressure. The membrane is made of amorphous material to optimize dimensions of the sensor. The material has Young's modulus greater than 50 gigapascal, where ratio between elastic limit and the Young's modulus is greater than 0.01. The material comprises a metallic element such as precious metal alloys or precious metallic element e.g. gold, platinum, palladium, rhenium, rhodium, silver, iridium and osmium. An independent claim is also included for a watch comprising a pressure sensor and a conversion unit for converting a value representative of pressure into a depth value.
Patent TW-I409922-B (TW)
Title: Semiconductor package-on-package (pop) device with reinforcing vertical solder pillars
Inventor: CHIANG YU WEI
IPC: H01L23/52
Filed: 2009-12-08
Granted: 2013-09-21
Abstract: Disclosed is a semiconductor package-on-package (POP) device with reinforcing vertical solder pillars, comprising two semiconductor packages stacked together, a plurality of spacing solder balls and a plurality of vertical solder pillars. The two semiconductor packages are electrically connected by the spacing solder balls. The vertical solder pillars penetrate through vias of the two semiconductor packages where the two ends of the vertical solder pillars are respectively extruded from the substrates of the two semiconductor packages so that the two semiconductor packages are mechanically fixed. Accordingly, there can be supplied the extra stress resistance for entire POP structure to prevent crack of the spacing solder balls at peripheries of the two semiconductor packages caused by substrate warpage.
Patent TW-I410027-B (TW)
Inventor: NAGAYAMA TAKASHI
IPC: H02K7/10
Filed: 2010-03-16
Granted: 2013-09-21
Abstract: According to one embodiment, a traction motor includes a stator core, a rotor core, a first bearing, a second bearing, a rotor shaft, a first ventilation passage made at an outer circumference portion of the stator core, a first fan, and a second ventilation passage to introduce external air. And, in the motor, a first minute gap is provided between an end portion of a first fan main plate and an inner circumference portion of the first bracket, cooling wind is discharged to the motor outside via the second ventilation passage, an outer circumference portion of the first fan, a ventilation portion in the first bracket and the first ventilation passage, and the second ventilation passage is made so that the cooling wind entered from the first air intake port flows around the rotor shaft portion between the first ventilation fan and the first bearing.
Patent TW-I415669-B (TW)
Title: Manufacturing method of complex porous membrane
Inventor: FUJIKI HIROYUKI
IPC: B01D69/08
Filed: 2010-04-23
Granted: 2013-11-21
Abstract: Disclosed is a method for manufacturing a composite porous film having a stable film quality and a desired hollow shape by controlling the entrance of a film-forming resin solution into a hollow part of a hollow reinforcement support. The method is provided with a step of adhering a film-forming resin solution to the outer peripheral surface of the hollow reinforcement support and thereby forming a film intermediate, a step of adhering a coagulating liquid to the outer peripheral surface of the film intermediate, and a step of flowing the coagulating liquid along the outer peripheral surface of the film intermediate so that at least a part of the outermost interface of the coagulating liquid in the circumferential direction is a free surface and thereby coagulating the film-forming resin solution adhering to the outer peripheral surface of the hollow reinforcement support.
Patent TW-I406646-B (TW)
Title: Automatic bread maker
Inventor: TAGUCHI TERUAKI
IPC: A47J43/04
Filed: 2010-04-30
Granted: 2013-09-01
Abstract: This invention provides an automatic bread maker which sequentially performs a kneading process, a fermenting process and a baking process. The automatic bread maker has a bread container for receiving a material for making bread, the bread container having a driven shaft at the bottom for selectively mounting a kneading blade or a crushing blade, and a baking chamber in which the bread container is to be placed. The automatic bread maker also has a first driving shaft which is provided on the bottom of the baking chamber and can be connected with the driven shaft for transmitting a rotation to the kneading blade, and a second driving shaft which is provided at an offset position relative to the first driving shaft on the bottom of the baking chamber to be connected with the driven shaft for transmitting a rotation to the crushing blade.
Patent TW-I411909-B (TW)
Title: Electronic systems and electronic apparatuses using the same
Inventor: CHEN YI AN
IPC: G06F1/26
Filed: 2010-05-03
Granted: 2013-10-11
Abstract: An electronic apparatus for providing supply voltage to a first external device with a predetermined pin assignment specification is provided. The electronic apparatus includes a connection interface and a voltage supplier. The connection interface includes a first pin and a second pin. The voltage supplier provides a detection voltage signal to the first pin and determines whether to provide the supply voltage according to whether the second pin is at a first level in response to the detection voltage signal. When the second pin is at the first level in response to the detection voltage signal, the voltage supplier provides the supply voltage to the first pin.
Patent TW-I404402-B (TW)
Title: Data processing method during speech call
Inventor: Jiang ming yu
IPC: G10L15/08
Filed: 2010-06-15
Granted: 2013-08-01
Abstract: A data processing method during a speech call is provided, adapted for a communication apparatus in a speech call and the method includes the following steps. A speech recognition function is activated. A speech transmitted to a remote terminal of the speech call is terminated. A first speech keyword is received from a user, and data is searched according to a first speech keyword received. A second keyword is received to confirm whether to edit a short message according to the data. The speech recognition function is deactivated, and speech transmitting to the remote terminal is resumed. The short message is sent after the speech call is terminated.
Patent GB-2485734-B (GB)
Title: Pad cover
Inventor: CROFT NEIL DAVID
IPC: A63B69/00
Filed: 2010-03-15
Granted: 2013-12-04
Abstract: A cover for a protective sport pad including a cover portion for covering a surface of the pad, and a fastening means for fastening the cover to the protective sport pad. In one form, the protective sport pad is a cricket pad for a lower leg portion of a player, and the cover portion is arranged to cover an exposed surface of the pad. The cover portion may be formed of coloured material to change the colour of the protective sport pad.
Patent GR-1817-B (GR)
Title: Τελειοποιησεις εις κυτιδιον πυρειων εν ειδει βιβλιαριου.
Filed: 1928-04-18
Abstract: υτίδιον πυρείων δίκην βιβλιαρίου ή περίβλημα περιλαμβάνον επιμήκη λωρίδα εκ χαρτονίου αναδιπλουμένην εφ' εαυτήν εγκαρσίως εις πολλάς απ' αλλήλων αφισταμένας χώρας και τας πτυχάς αντιστοίχως εν ουσιαστική παραλλήλω διατάξει και σχηματισμόν κατασκευήνδίκην βιβλιαρίου εχούσης δύο διαμερίσματα χωριζόμενα από εγαρσίου διατρήτου τοιχώματος και συγκρατουμένης εν δεδιπλωμένη καταστάσει, συνδιαζόμενον μετά πληθύος στελεχών πυρείων ως τα σώματα εκτείνονται δια μέσου ενός των διαμερισμάτων και του διατρήτου τοιχώματος με τας κεφαλάς των διατεταγμένων εντω ετέρω διαμερίσματι κάτωθεν του διατρήτου τοιχώματος και συγκρατούνται σταθερώς επενεργεία τριβήςεν αυτώ.
Patent GR-2355-B (GR)
Title: Τελειοποιησεις εις και εν σχεσει προς κινηματογραφικας προβολικας συσκευας.
Filed: 1929-06-19
Abstract: ινηματογραφική προβολική συσκευή εφοδιασμένη δια μέσων τιθεμένων εις λειτουργίαν επενεργεία της βαρύτητος προς αυτόματον διακοπήν του ηλεκτρικού ρεύματος όταν θραυσθή η ταινία.
Patent GR-7563-B (GR)
Title: Βελτιωσεις εις μεθοδον και εγκαταστασιν δια την παραγωγην πλουσιων εις οκτανιον βενζινων και αρωματικων υδρανθρακουχων σωματων.
Filed: 1938-06-07
Abstract: έθοδος προς κατασκευή εις οκτάνια πλουσίων βενβικών και αρωματικών βαρέων υδρογονανθράκων, συνιστάμενη εις το να υπόκεινται  σε βαρέα υδροανθράκια εις μίαν μη δια καταλύτου θερμαντική κατεργασία εις πολλαπλή συνεχή στάδια, της θερμαντικής θερμοκρασίας εις έκαστο στάδιο, διεξαγόμενης εις το ειδικό της αντιδράσεως χώρον, άνευ βοηθείας υπερατμοσφαιρικής ή υποατμοσφαιρικής σχέσεως, εντός ορισμένων ατμοσφαιρικών διαστημάτων εις τρόπον ώστε η διάσχασις, αποϋδρογώνοσις, κυκλώσιν και πολυμερισμός να λαμβάνουν χώρο  εις τα ιδιαίτερα στάδια υπό άμεσο επιθεώρησιν και  ευνοϊκών υλών.
Patent GR-17422-B (GR)
Title: Τελειοποιησεις εις και εν σχεσει προς προσφυομενον ιατρικον και χειρουργικον επιδεσμικον υλικον.
Filed: 1956-05-19
Abstract: ις την κατασκευήν προσφυομένου επιδεσμικού υλικούιατρικής και χειρουργικής χρήσεως, του εκτεθέντοςτύπου, η μέθοδος της εφαρμογής μιας συγκολλητικήςύλης βασιζομένης επί της χρηισμοποιήσεως διαλύτου, επί του πορώδους υποστρώματος, ήτις χρησιμοποιείως φορέα δια την φέρουσαν το πρότυπον σχέδιον μάζαν ένα βραδέως περιστρεφόμενον κύριον κύλινδρον του οποίου η κυλινδρική καμπύλη επιφάνεια φέρει, εντετμημένας επ' αυτής, αβαθείς αύλακας συμφώνως προςτο πρότυπον σχέδιον, εις τας οποίας αύλακας, καθ'όν χρόνον ο κύλινδρος περιστρέφεται, η συγκολλητική μάζα, ευρισκομένη εις μίαν σχετικώς υγράν κατάστασιν μικράς συνεκτικότητος, παρέχεται κατά μίαν ζώνην, ακολούθως δε αι φορτισθείσαι αύλακες μεταβαίνουν εις μίαν θέσιν μεταβιβάσεως απέχουσαν κατά μίαν επαρκή γωνιακήν απόστασιν, ώστε να καταστή δυνατόν, δι' εξατμίσεως μέρους του περιεχομένου διαλύτου, όπως το μεγαλύτερον τμήμα του πάχους της εντόςτων αυλάκων συγκολλητικής μάζης μεταβάλη κατάστασιν και από της υγράς καταστάσεως μεταβή εις μίαν ευκόλως προσφυομένην, στιφροτέραν και περισσότερον συνεκτικήν κατάστασιν, ενός υπολείμματος της ρηθείσης μάζης αφιεμένου όμως εις την υγράν κατάστασιν κατά την βάσιν των αυλάκων ένθα η μεταβίβασις της φερούσης το πρότυπον σχέδιον συγκολλητικής μάζης εις το πορώδες υπόστρωμα επιτελείται υπό τινος κυλίνδρου μεταβιβάσεως έχοντος την αυτήν περιφερικήν ταχύτητα.
Patent GR-20944-B (GR)
Title: Βελτιωμενη, θρεπτικως ισορροπος συνθεσις κτηνοτροφης.
Inventor: HUHTANEN CHARLES NORMAN
Filed: 1960-02-01
Abstract: ία βελτιωμένη, θρεπτικώς ισόρροπος σύνθεσις κτηνοτροφής, περιέχουσα εν αντιβιοτικόν ευρέος φάσματοςτου τύπου της τετρακυκλίνης και πηγάς ασβεστίου και φωσφόρου, εις την οποίαν η πηγή του ασβεστίου είναι θειϊκόν ασβέστιον, και η πηγή του φωσφόρου αποτελείται κατ' ουσίαν εκ μιας ενώσεως φωσφορικού οξέος απηλλαγμένης κατ' ουσίαν ασβεστίου.
Patent GR-82221-B (GR)
Inventor: WEBER KARL-HEINZ
IPC: C07D207/263
Filed: 1984-07-23
Abstract: Compounds of the formula   <IMAGE>   wherein R1 is hydrogen or alkyl of 1 to 4 carbon atoms; and R2 is pyridyl, phenyl or mono-, di- or tri-substituted phenyl, where the substituents are alkyl of 1 to 2 carbon atoms, alkoxy of 1 to 2 carbon atoms, fluorine, chlorine, bromine, trifluoromethyl, nitro, benzyloxy or hydroxyl. The compounds are useful as nootropics.
Patent GR-80616-B (GR)
Title: Cyclohexan-1,3-dione derivatives, method for the preparation thereof, their use as herbicide
Inventor: JOHN DIETER DR
IPC: C07D319/06
Filed: 1984-10-11
Abstract: Cyclohexane-1,3-dione derivatives of the formula   <IMAGE>   where A is tetrahydropyran-4-yl, 3-methyltetrahydropyran-4-yl, 1,4-dioxanyl, 5,5-dimethyl-1,3-dioxan-2-yl, 2,5-dimethyl-1,4-dioxan-3-yl, 2,6-dimethyl-1,4-dioxan-3-yl, 2-methyl-1,3-dithiolan-2-yl, 2,6-dimethyltetrahydrothiopyran-3-yl, 2-methyl-1,3-dithian-2-yl or unsubstituted or substituted 1,3-dioxepan-5-yl, R1 is hydrogen or methoxycarbonyl, R2 is alkyl and R3 is alkyl, alkenyl, haloalkenyl or propargyl, are used for controlling undesirable plant growth of grass species, especially in broadleaved crops and monocotyledon crops which do not belong to the grass family.
Patent GR-862214-B (GR)
Title: Novel compounds
Inventor: WILLIAM ELSON STEPHEN
IPC: A61K31/397
Filed: 1986-08-27
Abstract: A compound having the formula (I):is described, together with salts thereof and an enzymatic process for converting such compounds into clavulanic acid.A process for the preparation of the compound of formula (I) and its salts is disclosed, together with intermediates for use therein.
Patent GR-871983-B (GR)
Title: Cast aluminium rail of a curve shape
Inventor: PANAGIOTIS ZOUMPOULOGLOU
Filed: 1987-12-22
Abstract: Curved shaped aluminium cast baluster, wavy on both sides and with radial grooves.
Patent GR-1000038-B (GR)
Inventor: TACHOS VASILEIOS
Filed: 1988-12-15
Abstract: Με πειραματικές διαδικασίες ανακαλύψαμε ότι η μαγιά ή ζύμη αρτοποιίας προλαμβάνει την εμφάνιση της τερηδόνας των δοντιών. Η ευεργετική της επίδραση αποδίδεται στο γεγονός ότι με την ζύμωση που επιφέρει στους υδατάνθρακες αποτρέπει την δημιουργία γαλακτικού οξέος και στην συνεπαγόμενη από αυτό πτώση του ΡΗ κάτω του 5,2 στο περιβάλλον των δοντιών. Ακόμη, η σε επάρκεια παρατηρούμενη ζύμη παρουσία του φωσφόρου και μαγνησίου καθώς και της ομάδας των βιταμινών Β επιδρά ευεργετικώς επί της ρυθμιστικής ικανότητας του σιέλου και δι' αυτής, εμμέσως, στην πρόληψη της τερηδόνας. Επιζητείται η αξιοποίηση της εφευρέσεως, δια Διπλώματος Ευρεσιτεχνίας προς αποκλειστική παρασκευήν οδοντοφυράματος, διαλύματος, ταμπλέτας και μαστίχας προς χρήση για την πρόληψη της τερηδόνας.ω